Read to Me in InteractPlayer

Thanks to Alin Matel's advice a couple months ago, I've been able to get the read-to-me function working on my book -- but only on my computer. When I share the book with myself and read it on my iPad, the read-to-me option doesn't work. There are other sound effects, there's just no reading sound. Any ideas on why this is/how I can fix it? Thank you for your time and feedback.